L40.1 — Generalized pustular psoriasis
Is L40.1 billable?
Yes — L40.1 is billable for FY2027. L40.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. L40.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
L40.1 at a glance
| Code | L40.1 |
|---|---|
| Description | Generalized pustular psoriasis |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does L40.1 group to?
L40.1 sits in MDC 09 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 606Minor Skin Disorders with MCCmedical
- 607Minor Skin Disorders without MCCmedical
How is L40.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to L40.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Von Zumbusch's disease
- Impetigo › herpetiformis (any organism) (any site) (circinate) (contagiosa) (simplex) (vulgaris)
- Psoriasis › pustular
- Impetigo › herpetiformis › nonobstetrical (any organism) (any site) (circinate) (contagiosa) (simplex) (vulgaris)
Inclusion terms
Alternative wording in documentation that is classified to L40.1.
- Impetigo herpetiformis
- Von Zumbusch's disease
Excludes2 — not included here — inherited from Chapter 12
The conditions below are not part of L40.1, but a patient may have both at the same time. When documentation supports it, L40.1 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- lipomelanotic reticulosis (I89.8)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- viral warts (B07.-)
How long has L40.1 existed?
L40.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with L40.1?
ICD-10-CM declares these codes mutually exclusive with L40.1 — exactly one of each pair can be correct for a given encounter.